sqrt(8+8/8)*(sqrt(8+8/8)-1)*(sqrt(8+8/8)-1)
    (sqrt(8+8/8))
    8-sqrt(sqrt(8))
    !(2)
    !(5)
    4042*252+2021
    505/2
    sqrt(-9)=
    tan90
    tan0
    576+49
    24^2
    3+2
    1070/(1+10%)2+70/(1+10%)
    2/2(sqrt25)5^2+(1/3)5^3
    0.6×lg（0.6）×0.5％÷0.434
    0.023 0.626/0.02 (13710.3)^0.8 (4.725)^0.4
    -lg0.0009
    -lg0.52
    -lg0.65

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